package com.arthas.arthasforsba.utils.file;


import com.arthas.arthasforsba.constant.Constants;
import com.arthas.arthasforsba.exception.BaseException;
import com.arthas.arthasforsba.exception.file.FileNameLengthLimitExceededException;
import com.arthas.arthasforsba.exception.file.FileSizeLimitExceededException;
import com.arthas.arthasforsba.exception.file.InvalidExtensionException;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.UUID;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
@Component
public class FileUploadUtils implements InitializingBean {
    /**
     * 默认大小 500M
     */
    public static final long DEFAULT_MAX_SIZE = 500 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */

    private static String defaultBaseDir;
    @Value(value = "${file.base}")
    private String baseDir;

    public static void setDefaultBaseDir(String defaultBaseDir)
    {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir()
    {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException
    {
        try
        {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static String upload(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException
    {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > DEFAULT_FILE_NAME_LENGTH)
        {
            throw new FileNameLengthLimitExceededException(DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file,true);
        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        return getUploadPathFileName(baseDir, fileName);
    }

    private static String getPathFileName(String uploadDir, String fileName)
    {
        int dirLastIndex = defaultBaseDir.length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        return Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
    }

    private static String getUploadPathFileName(String uploadDir, String fileName)
    {
        int dirLastIndex = defaultBaseDir.length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        if("".equals(currentDir)){
            return  Constants.RESOURCE_PREFIX + "/" + currentDir + fileName;
        }
        return Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file)
    {
        String extension = getExtension(file);
        String fileName = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM")) + "/" + UUID.randomUUID() + "." + extension;
        return fileName;
    }

    public static final String extractFilename(MultipartFile file,Boolean raw)
    {
        String fileName;
        if (BooleanUtils.isTrue(raw)){
            fileName = file.getOriginalFilename();
        }else{
            fileName = extractFilename(file);
        }
        return fileName;

    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists())
        {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists())
        {
            desc.createNewFile();
        }
        return desc;
    }


    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException
    {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE)
        {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
        {
            if (allowedExtension == MimeTypeUtils.JAVA_EXTENSION)
            {
                throw new BaseException(fileName+"：文件格式不对！");
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
        for (String str : allowedExtension)
        {
            if (str.equalsIgnoreCase(extension))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file)
    {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension))
        {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        defaultBaseDir = baseDir;
    }
}
